Production of Dry Lean Concrete by Sustainable Materials to Use in Road Sub-Base Layer for Rigid Pavement

In the present scenario, due to the rapid demand on the infrastructure projects and consistent dependency over conventional materials have resulted in scarcity of the conventional construction materials and rise in construction costs. By replacing subbase layer of road with Dry lean concrete produced with sustainable materials, cost on the construction can be reduced by 51.4%. The various soil used in this study are red soil, loamy soil and black cotton soil. These soils are brought from different places of Bangalore. These soils are used to totally replace the fine aggregates. The LD slag obtained from JSW steel manufacturing plant from Bellary. To use the steel slag in concrete making process of Low strength Dry Lean Concrete, initial optimization of materials (steel slag) was done with the 7days strength. The most desirable and equivalent material to that of natural aggregates (i.e. steel slag) was found to be at 50% replacement and 100% replacement of coarse aggregate with LD slag. The each batch of concrete is prepared with soil and combination of 100% slag, 50% natural aggregates + 50% LD slag and 100% natural aggregates. The various soils used are red soil, loamy soil and BC soil. These cubes, cylinder and beams are tested for compressive strength, split tensile strength and flexure strength respectively for 7days and 28 days, and water absorption for each specimen of cube is measured at 28 days. It was observed that, strength of concrete produced using red soil, loamy soil are fulfilling the strength requirements of conventional dry lean concrete used as a sub base in rigid pavements. As per IRC: SP: 49-2014, the minimum strength requirement of cubes at 7 days is 7MPa.